<!--The content below is only a placeholder and can be replaced.-->
<div style="text-align:center">
  <h1>
    Welcome to {{ title }}!
  </h1>
  <a (click)="refresh()"> <img [src]="img" width="100" height="50"/> </a>
</div>

<!--demo子组件-->
<app-demo></app-demo>

<router-outlet></router-outlet>